CAJ | 학술논문

东准噶尔地区石炭纪巴塔玛依内山组火山岩-次火山侵入岩发育。本文以卡拉麦里构造带东南部松喀尔苏地区次火山侵入岩--花岗闪长斑岩为研究对象，通过岩石学、SHRIMP锆石U-Pb和Sr-Nd同位素方面的研究发现，所有锆石都具岩浆成因，锆石U-Pb年龄可分为多组，其中最小的一组年龄为305.5~316.3 Ma，代表岩体的形成时间，其他年龄多与准噶尔地区产出的具洋壳和岛弧性质的岩浆岩时代一致。岩石具正的εNd（t）（3.0~15.1），中等的87Sr/86Sr初始值（0.703861~0.713151），较小的T2DM（412~839）。反映了东准噶尔地区基底可能由底侵幔源物质和奠基于有限前寒武纪结晶基底之上的古生代残余洋壳、岛弧体系组成，花岗闪长斑岩是新生地壳物质和少量幔源岩浆共同作用的产物，其形成可能与晚古生代古亚洲洋持续的向哈萨克斯坦-准噶尔板块俯冲消减诱发卡拉麦里地区弧后扩张有关。
동준갈이지구석탄기파탑마의내산조화산암-차화산침입암발육。본문이잡랍맥리구조대동남부송객이소지구차화산침입암--화강섬장반암위연구대상，통과암석학、SHRIMP고석U-Pb화Sr-Nd동위소방면적연구발현，소유고석도구암장성인，고석U-Pb년령가분위다조，기중최소적일조년령위305.5~316.3 Ma，대표암체적형성시간，기타년령다여준갈이지구산출적구양각화도호성질적암장암시대일치。암석구정적εNd（t）（3.0~15.1），중등적87Sr/86Sr초시치（0.703861~0.713151），교소적T2DM（412~839）。반영료동준갈이지구기저가능유저침만원물질화전기우유한전한무기결정기저지상적고생대잔여양각、도호체계조성，화강섬장반암시신생지각물질화소량만원암장공동작용적산물，기형성가능여만고생대고아주양지속적향합살극사탄-준갈이판괴부충소감유발잡랍맥리지구호후확장유관。
Late Paleozoicvolcanic-subvolcanic-intrusive rocks in Eastern Junggar are developed.Songkaersu granodiorite porphyry,as a part of them,formed in the southeast Kalamali tectonic belt.Petrography,SHRIMP zircon U-Pb and Sr-Nd isotope indicate that all zircons selected are magmatic, and the zircons U-Pb concordant ages of two samples may be sub-divided into many groups,of which the youngest concordant age is 305.5~316.3Ma which can be interpreted as the for-mation age of Songkaersu granodiorite porphyry.On the other hand,others ages such as early Cambrian to early Carbonif-erou are consistent with the ages of oceanic-crust and island-arc magmatic rocks around the Junggar Basin.Moreover,the positiveεNd(t)(3.0 to 15.1), medium 87Sr/86Sr initial ratios (0.703 861 to 0.713 151), and smaller T2DM (412 to 839) may imply that the eastern basement of the Junggar Basin was tectonically amalgamated by underplating of mantle-derived substances and different Paleozoic remnant oceanic crust and arc complexes upon the minor Precambrian continental crust . Songkaersu granodiorite porphyry may result from the interaction of a amount of new-born lower crust and minor asthenospheric mantle or depleted lithospheric mantle,and the formation mechanism of them perhaps might be related to the subduction of the Paleo-Asian oceanic plate under the Kazakhstan-Junggar plate and result in back-arc spreading.